Add markdown rendering in Instructor's message box

[bkayes]

I'd like to have markdown rendering in the instructors message box so that we can embed links and bold certain important items.

[mterwill]

Makes sense. Maybe something like https://github.com/markedjs/marked?

[pl98]

Hi @mterwill! @annieli555 and I are interested in working on this issue, is it still available?

[mterwill]

Yes!